单词	the flap of an envelope
释义	the flap of an envelope. 信封的封盖
随便看	systematic components systematic computer adjustment of network systematic configuration systematic conflictions systematic confrontation systematic conservation systematic consideration Systematic Constitution systematic construct systematic construction systematic construction on agility systematic continuous sequence approach systematic contrast systematic contrastive study systematic convergence error systematic convolutional code systematic correction systematic count systematic countermeasure systematic coupling Systematic Creation systematic credit systematic criteria systematic critics systematic cross